Abstract
How to overcome the bottleneck of Pt–based catalysts is a research focus in the field of energy conversion, and the combination of metal oxide with Pt–based catalysts is a promising strategy to avoid platinum aggregation and introduce novel photosensitivity into traditional Pt catalysts by virtue of the photosensitivity of metal oxide semiconductors. In this work, Pt–MoOx/graphene (S) (simplified as Pt–MoOx/GN (S)) was synthesized by a solid–phase reaction with Na2MoO4 as the Mo precursor, in which Na2MoO4 was partially reduced to MoO2, leading to the formation of MoOx in the composite. The integration of MoOx with Pt results in the uniform dispersion of Pt nanoparticles. Electrochemical tests reveal that the catalytic activity of Pt–MoOx/GN (S) is comparable to that of commercial 30% PtRu/C–JM toward the oxygen reduction reaction via a 4–electron transfer process. In particular, Pt–MoOx/GN (S) displays a more positive reduction potential and stronger stability, which is ascribed to the synergies between MoOx and Pt. Owing to the introduction of photo–responsive MoOx species, Pt–MoOx/GN (S) also exhibits significantly higher mass activity under simulated sunlight illumination, which is 1.62 times as much as that without illumination. The result is in favor of converting solar energy into electric energy during a traditional electrocatalytic process.
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The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work was financially supported by the National Natural Science Foundation of China (Grant No. 21571034) and the Research Foundation of the Education Department of Fujian Province (Grant No. JAT170150).
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Experimental investigation: XD, YW, YL. Data curation, Software, Formal analysis, Visualization and Writing of the Original Draft: XD, YW. Validation: YL. Conceptualization, Methodology, Resources, Funding acquisition, Project administration, Supervision, and writing–review & editing: ZL, SL.
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Duan, X., Wu, Y., Lai, Y. et al. Synthesis of Pt–MoOx/graphene composite and its electro–photo synergistic catalysis for oxygen reduction reaction. J Appl Electrochem 52, 115–123 (2022). https://doi.org/10.1007/s10800-021-01622-5
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DOI: https://doi.org/10.1007/s10800-021-01622-5